Cream of Tartar as a Supplement: Potassium, Dosage, and Safety

This page provides general educational information. It is not medical advice, and it does not provide a diagnosis or a personal course of care.

What Cream of Tartar Actually Is

Cream of tartar is the common name for potassium bitartrate, also written as potassium hydrogen tartrate. It forms naturally during winemaking. As grape juice ferments, tartaric acid crystallises out onto the sides of the barrel as a hard sediment that winemakers call argol or wine lees. That sediment is collected, purified, and ground into the fine white powder you find in the baking aisle.

So it is a food. It has been in kitchens for centuries, mostly as the acid half of baking powder and as the thing that keeps egg whites stable when you whip them. What is less widely appreciated is that it is also, chemically speaking, a concentrated potassium salt — and that is why it turns up in supplement form at all.

How Much Potassium Is in Cream of Tartar?

This is the question we get asked most often, and most articles about cream of tartar never answer it directly. So, plainly:

Those figures are approximate. Teaspoon weights vary with how tightly the powder packs, and published composition tables differ slightly. Treat them as a good working estimate rather than a laboratory measurement.

For scale: the National Academies set the adequate intake for potassium at 3,400 mg a day for adult men and 2,600 mg for adult women. A medium banana has roughly 420 mg. So a teaspoon of cream of tartar is somewhere between a banana and a banana and a half — not a trivial amount, and not a megadose either. It is worth knowing which of those two things you are dealing with.

Is Cream of Tartar the Same as Potassium Chloride?

No, though people ask this constantly and the confusion is understandable. Both are potassium salts. Potassium chloride is what most salt substitutes are made from, and it is also what clinicians reach for when someone needs potassium replaced under supervision. Potassium bitartrate is a different salt with a different anion, a different taste — mildly tart rather than metallic — and a lower potassium density by weight.

What they have in common is more important than what separates them: both raise the potassium load your kidneys have to handle. If a doctor has told you to avoid salt substitutes, that advice applies here too.

Is Cream of Tartar Safe?

For most healthy adults, in culinary and ordinary supplemental amounts, yes. It is a food-grade ingredient with a long history of use and no exotic pharmacology.

But we would rather be the ones to tell you the other half of this, because you will find it on your own if you look.

Who Should Talk to a Doctor First

Potassium is cleared by the kidneys, and several common prescriptions change how much of it your body holds on to. Please speak with your doctor or pharmacist before adding cream of tartar in supplemental amounts if any of these apply:

• Reduced kidney function of any kind, or a history of kidney disease. This is the single most important one.
• ACE inhibitors — lisinopril, enalapril, ramipril and others. These raise serum potassium.
• ARBs — losartan, valsartan, irbesartan and others. Same effect.
• Potassium-sparing diuretics — spironolactone, triamterene, amiloride.
• Salt substitutes or an existing potassium supplement. These stack.
• Regular NSAID use, which can reduce potassium excretion.
• Pregnancy or nursing, where the general rule for any supplement is to ask first.

None of that is a reason for most people to avoid it. It is a reason for some people to have a short conversation before starting. Those are different things, and the difference matters.

How Much Is Too Much?

There is no established upper limit for potassium from food in healthy adults with normal kidney function, precisely because healthy kidneys are good at excreting the excess. That is the reassuring part. The unreassuring part is that the phrase doing the work in that sentence is normal kidney function, and reduced kidney function is common and often undiagnosed, particularly with age.

Our own guidance is unglamorous: use the serving on the label, do not stack it with other potassium sources without asking someone, and do not treat “more must be better” as a working theory. If you want to know where your potassium actually sits, a basic metabolic panel will tell you and your doctor can order one.

Cream of Tartar and Digestion

People search for whether cream of tartar is good for the gut, so it is worth addressing directly. Potassium is an electrolyte involved in normal smooth muscle function throughout the body, and the digestive tract is smooth muscle. That is a general physiological role, not a treatment claim, and we are not going to dress it up as more than that.

Separately, in larger amounts cream of tartar has a mild laxative effect — which is a genuine historical use and also a practical reason not to take more than the label says on a whim.

Culinary Use Versus Supplemental Use

Most people meet cream of tartar in a recipe. A pinch stabilises egg whites, keeps sugar syrups from crystallising, and combines with baking soda to make baking powder. In those amounts — an eighth of a teaspoon across a whole cake — the potassium contribution is negligible and none of the cautions above are relevant.

Supplemental use means a measured serving taken deliberately, daily. That is a different proposition, and it is the one this page is about. If you arrived here from a baking question, the short answer is that a pinch in a recipe is not something to worry about.

What Tarsul Is

Tarsul combines organic cream of tartar with organic MSM sulfur. Two ingredients, no fillers or binders. We have been selling it from San Diego since 2010, largely to people who found us because they remembered sulfur and cream of tartar from a grandparent’s medicine cabinet.

If you want the specifics on what is in it and how it is taken, our ingredients page covers the formula and our dosage and precautions page covers serving size and warnings in full. The other half of the formula is explained on our MSM sulfur page.

Frequently Asked Questions

Is cream of tartar basically potassium?

Essentially, yes. It is potassium bitartrate, a potassium salt, and potassium makes up roughly a sixth of it by weight.

Does cream of tartar raise potassium levels?

It contributes dietary potassium, so it can. In people with healthy kidneys and normal intake that is unremarkable. In people with reduced kidney function or on potassium-raising medication it is exactly the thing to discuss with a doctor first.

How much cream of tartar per day?

Use the serving printed on the product you have. We do not publish condition-specific dosing, and we would be sceptical of anyone who does.

What are the side effects?

In ordinary amounts, most people notice nothing. Larger amounts can loosen stools. The serious concern is not a side effect in the usual sense but the potassium load, which matters for the specific groups listed above.

Is cream of tartar the same as baking soda?

No. Baking soda is sodium bicarbonate and is alkaline. Cream of tartar is acidic. Combining them is what produces the lift in baking powder.

Is it safe during pregnancy?

Culinary amounts are food. For supplemental amounts, ask your provider — the standard advice for any supplement during pregnancy, and we are not going to make an exception for ours.